[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.035657] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.624022] random: sshd: uninitialized urandom read (32 bytes read) [ 29.963292] random: sshd: uninitialized urandom read (32 bytes read) [ 30.444670] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 36.054987] urandom_read: 1 callbacks suppressed [ 36.054990] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.145215] BUG: unable to handle kernel paging request at ffffeafff90b0020 [ 36.152646] IP: [<ffffffff814f5147>] page_remove_rmap+0x37/0x6d0 [ 36.158906] PGD 0 [ 36.160851] [ 36.162484] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.166957] Dumping ftrace buffer: [ 36.170469] (ftrace buffer empty) [ 36.174168] Modules linked in: [ 36.177477] CPU: 1 PID: 3798 Comm: syz-executor118 Not tainted 4.9.120-gf85543b #76 [ 36.185249] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.194588] task: ffff8801b74bc800 task.stack: ffff8801b79c8000 [ 36.200626] RIP: 0010:[<ffffffff814f5147>] [<ffffffff814f5147>] page_remove_rmap+0x37/0x6d0 [ 36.209306] RSP: 0018:ffff8801b79cf948 EFLAGS: 00010246 [ 36.214727] RAX: dffffc0000000000 RBX: ffffeafff90b0000 RCX: 0000000000000000 [ 36.221977] RDX: 1ffffd5fff216004 RSI: ffffffff814f5128 RDI: ffffeafff90b0000 [ 36.229251] RBP: ffff8801b79cf970 R08: 0000000000034220 R09: 0000000000000001 [ 36.229254] R10: ffff8801b74bc800 R11: 0000000000000001 R12: ffff8801b79cfc08 [ 36.229256] R13: ffffeafff90b0020 R14: ffffeafff90b0000 R15: 0000000000000001 [ 36.229260] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.229263] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.229265] CR2: ffffeafff90b0020 CR3: 00000001c1235000 CR4: 00000000001606f0 [ 36.229270] Stack: [ 36.229283] ffffeafff90b0020 ffff8801b79cfc08 ffff8801c10a1800 ffffeafff90b0000 [ 36.229288] ffff8801b5a94108 ffff8801b79cf9c8 ffffffff8154bfcf ffff8801b79cfc18 [ 36.229293] ffff8801b79cfc10 ffff8801b79cfc88 00003ffe42c001e0 00000001c10a1000 [ 36.229295] Call Trace: [ 36.229307] [<ffffffff8154bfcf>] zap_huge_pmd+0x16f/0x860 [ 36.229313] [<ffffffff814ca80d>] unmap_page_range+0x12ad/0x1730 [ 36.229318] [<ffffffff814c9560>] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 36.229323] [<ffffffff814cad91>] unmap_single_vma+0x101/0x260 [ 36.229327] [<ffffffff814cb6d2>] unmap_vmas+0x102/0x1d0 [ 36.229331] [<ffffffff814e40c4>] exit_mmap+0x214/0x3f0 [ 36.229335] [<ffffffff814e3eb0>] ? SyS_munmap+0xa0/0xa0 [ 36.229341] [<ffffffff8122e00a>] ? up_write+0x1a/0x60 [ 36.229347] [<ffffffff8112d5a3>] mmput+0xf3/0x2d0 [ 36.229352] [<ffffffff81142ad6>] do_exit+0x906/0x27b0 [ 36.229357] [<ffffffff811421d0>] ? release_task.part.19+0x1210/0x1210 [ 36.229361] [<ffffffff8122e00a>] ? up_write+0x1a/0x60 [ 36.229365] [<ffffffff814ec63d>] ? do_mprotect_pkey+0x71d/0x890 [ 36.229368] [<ffffffff814ebf20>] ? mprotect_fixup+0x930/0x930 [ 36.229373] [<ffffffff81148c91>] do_group_exit+0x111/0x340 [ 36.229377] [<ffffffff81148ec0>] ? do_group_exit+0x340/0x340 [ 36.229381] [<ffffffff81148edd>] SyS_exit_group+0x1d/0x20 [ 36.229386] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 36.229392] [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.229454] Code: 55 41 54 53 48 89 fb e8 c8 b6 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 93 b6 e6 [ 36.229459] RIP [<ffffffff814f5147>] page_remove_rmap+0x37/0x6d0 [ 36.229460] RSP <ffff8801b79cf948> [ 36.229462] CR2: ffffeafff90b0020 [ 36.229469] ---[ end trace 55817482f3eab03e ]--- [ 36.229472] Kernel panic - not syncing: Fatal exception [ 36.236809] Dumping ftrace buffer: [ 36.236811] (ftrace buffer empty) [ 36.236814] Kernel Offset: disabled [ 36.463364] Rebooting in 86400 seconds..